PAN-TEX.NET

When you can measure what you are speaking about, and express it in
numbers, you know something about it; but when you cannot measure it,
when you cannot express it in numbers, your knowledge is of a meager
and unsatisfactory kind: it may be the beginning of knowledge, but
you have scarcely, in your thoughts, advanced to the stage of science.
Lord Kelvin 1824-1907